CN110146768A - Earth leakage protective device self-checking unit and earth leakage protective device - Google Patents
Earth leakage protective device self-checking unit and earth leakage protective device Download PDFInfo
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- CN110146768A CN110146768A CN201910366354.0A CN201910366354A CN110146768A CN 110146768 A CN110146768 A CN 110146768A CN 201910366354 A CN201910366354 A CN 201910366354A CN 110146768 A CN110146768 A CN 110146768A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2851—Testing of integrated circuits [IC]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
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- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses earth leakage protective device self-checking unit and earth leakage protective devices.Self-checking unit includes application circuit, self-test chip, simulation electric leakage generation circuit.Application circuit includes tripping coil, thyristor, current-limiting resistance, high-power switch tube and electric resistance partial pressure branch, power supply circuit, mutual inductor；Mutual inductor, the simulation leakage current that induction simulation electric leakage generation circuit generates；Power supply circuit provides supply voltage for earth leakage protective device chip, self-test chip；Self-test chip includes: reference voltage generation module, provides reference voltage for comparator；The electric resistance partial pressure branch is divided and is compared with reference voltage by hysteresis comparator, generates the comparison pulse of electric resistance partial pressure branch partial pressure；Reference circuit provides direct current biasing；Clock generation module provides clock for digital processing module.Digital processing module, including counting module, selftest module.The self-test that the present invention can periodically carry out earth leakage protective device does not influence the normal work of load appliance during self-test.
Description
Technical field
The present invention relates to IC design field more particularly to the self-test chips of the regular self-test of earth leakage protective device.
Background technique
With the increasingly raising of living standard, Electrical Safety is increasingly by the attention of state and society.Earth leakage protective device at
For the indispensable leakage protection electric appliance of every household.However the earth leakage protective device to operate with failure makes user lose electric shock
With the protection of electrical fire.Since inspecting periodically for existing earth leakage protective device needs manual operation, confession will cause in operating process
Electricity interrupts, and the user more than 90% can not neglect there is no periodically tripping self-test, the risk of earth leakage protective device abnormal work is carried out
Depending on.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of earth leakage protective device self-checking unit and earth leakage protective device.
A kind of earth leakage protective device self-checking unit, comprising: self-test chip, application circuit, simulation electric leakage generation circuit；
The application circuit includes: tripping coil, thyristor, current-limiting resistance, high-power switch tube and electric resistance partial pressure branch, power supply
Circuit, mutual inductor；
Simulation electric leakage generation circuit, including triode and resistance, generate simulation leakage current；
Mutual inductor, the simulation leakage current that induction simulation electric leakage generation circuit generates；
Power supply circuit provides supply voltage for earth leakage protective device chip, self-test chip；
The self-test chip includes:
Reference voltage generation module provides reference voltage for comparator；
The electric resistance partial pressure branch is divided and is compared with reference voltage by hysteresis comparator, generates electric resistance partial pressure branch partial pressure
Comparison pulse；
Reference circuit provides direct current biasing；
Clock generation module provides clock for digital processing module；
Digital processing module, including counting module, selftest module；
The selftest module includes two parts, and a part is high-power switch tube self-test submodule, and another part is mutual inductance
Coil, earth leakage protective chip, thyristor and tripping coil self-test submodule；Digital processing module is for generating application circuit
Signal is controlled, the working condition of self-test chip output pin is controlled, the comparison result of processing hysteresis comparator output judges to thread off
Whether coil, thyristor, the function of mutual inductor and earth leakage protective chip are normal, if discovery failure, output termination signal.
The self-test chip 1 after powering on 2s for the first time to tripping coil, thyristor, mutual inductor, high-power switch tube with
And earth leakage protective chip is detected, if discovery failure, generates termination signal disconnecting circuit；If function is normal, self-test is complete for the first time
A self-test is carried out every 15min after, does not influence the normal work of load appliance during self-test.
The application circuit controls high-power switch tube by controlling the grid or base voltage of high-power switch tube
The on-off of place branch.
The high-power switch tube keeps high in the time from except the overhaul period, the grid or base stage of high-power switch tube
Level does not influence the normal work of earth leakage protective device.
The simulation electric leakage generation circuit, is carrying out mutual inductor, earth leakage protective chip, thyristor and tripping coil failure
During detection, triode is switched on, which generates simulation leakage current, to detect mutual inductor, earth leakage protective chip, brilliant lock
The function of pipe and tripping coil.
The counting module includes 2s counter, 15min counter, two 20ms counters, 60ms counter, wherein
2s counter triggers two 20ms counters for power-on self-test for the first time；After 15min counter is used for self-test for the first time
A self-test is carried out every 15min, triggers two 20ms counters；The first counter of 20ms is for being limited in 0 ~ 20ms to big
Power switch tube carries out fault detection, and the second counter of 20ms is for triggering 60ms counter and simulation electric leakage signal；60ms meter
Number device carries out failure inspection to mutual inductor, earth leakage protective chip, thyristor and tripping coil for being limited in 20 ~ 80ms
It surveys.
High power switch tube grid or base stage are locked in low by the high-power switch tube detection module in 0 ~ 4ms
Level, digital processing module output function control signal and set high-power switch tube detection for SCR TEST pin function, lead to
It crosses SCR TEST pin and the drain electrode of high-power switch tube or collector is locked in high level；After 4ms, high-power switch tube is given
Grid perhaps base stage send high level pass through switching tube detect pin monitor high-power switch tube drain electrode or collector electricity
Pressure；If switching tube detection pin detects voltage failing edge in 4 ~ 20ms, then illustrate that the function of high-power switch tube is normal,
It closes and resets the first counter of 20ms, high power switch tube grid or base stage are relocked as low level, by SCR TEST
Pin function is switched to thyristor detection function；If switching tube detection pin is continuously high level, then explanation is big in 4 ~ 20ms
Power switch tube does not have normally, and the first counter of 20ms is completed after counting, and output high level triggers termination signal.
Second counter of 20ms is completed after counting, and triggers 60ms counter, and trigger FAULT TEST pin
High level is exported, turn-on transistor generates simulation leakage current.
The counting module triggers 60ms counter by the second counter of 20ms, and trigger FAULT in 20ms
TEST pin exports high level, generates simulation leakage current；Mutual inductor induction simulation leakage current, earth leakage protective chip processing mutual inductance
The coil-induced electric leakage signal arrived sends trip signal, drives turn on thyristors；The grid or base stage quilt of high-power switch tube
It is locked in low level, can only only be enough conducting thyristor by resistance branch conducting thyristor, the electric current of resistance branch, can not make
Tripping coil tripping, does not influence the normal work of load appliance；It, can if the function of mutual inductor and earth leakage protective chip is normal
Enough generate trip signal；If thyristor function is normal, and tripping coil is normally connect with phase line, trip signal conducting thyristor
Afterwards, the crest voltage of electric resistance partial pressure branch is higher than reference level, is obtained by SCR TEST pin monitoring resistor bleeder circuit
Partial pressure, if the crest voltage of electric resistance partial pressure branch is higher than reference voltage, hysteresis comparator exports high level pulse, illustrates mutual inductance line
Circle, earth leakage protective chip, thyristor and tripping coil function are normal.The high level pulse that comparator generates is for turning off 60ms
Counter, triggering FAULT TEST pin export low level, and shutdown simulation leakage current will be big after thyristor is completely switched off
The grid or base stage of power switch tube relock as high level；If comparator is in 20 ~ 80ms without output high level
Pulse illustrates with the presence of element failure in mutual inductor, earth leakage protective chip, thyristor or tripping coil, when 60ms is counted
Device is completed after counting, and counter generates high level and triggers termination signal.
A kind of earth leakage protective device using the earth leakage protective device self-checking unit, including self-test chip, application circuit, mould
Quasi- electric leakage generation circuit, earth leakage protective chip, application circuit are connected with earth leakage protective chip.
Beneficial effects of the present invention: can periodically carry out the self-test of earth leakage protective device, if discovery failure, output termination letter
Number.During self-test, the normal work of load appliance is not influenced.
Detailed description of the invention
Fig. 1 is the application circuit of earth leakage protective device self-checking unit of the present invention；In figure, self-test chip 1, application circuit 2, mould
Quasi- electric leakage generation circuit 3, mutual inductor 4, earth leakage protective chip 5, power supply circuit 6.
Fig. 2 is the structural block diagram of self-test chip；
Fig. 3 is SCR TEST pin function control module schematic diagram.
Specific embodiment
Present invention electric leakage self-checking unit is described in detail below.
As shown in Figure 1, a kind of earth leakage protective device self-checking unit, comprising: self-test chip 1, application circuit 2, simulation electric leakage produce
Raw circuit 3；The application circuit 2 includes: tripping coil, thyristor, current-limiting resistance, high-power switch tube and electric resistance partial pressure branch
Road, power supply circuit 6, mutual inductor 4；Simulation electric leakage generation circuit 3, including triode and resistance, generate simulation leakage current；Mutual inductance
Coil 4, the simulation leakage current that induction simulation electric leakage generation circuit 3 generates；Power supply circuit 6 does not belong to for earth leakage protective device chip 5(
In earth leakage protective device self-checking unit, belong to earth leakage protective device), self-test chip 1 provide supply voltage；
As shown in Fig. 2, the self-test chip 1 includes:
Reference voltage generation module provides reference voltage for comparator；
The electric resistance partial pressure branch is divided and is compared with reference voltage by hysteresis comparator, generates electric resistance partial pressure branch partial pressure
Comparison pulse；
Reference circuit provides direct current biasing；
Clock generation module provides clock for digital processing module；
Digital processing module, including counting module, selftest module,
The selftest module includes two parts, and a part is high-power switch tube self-test submodule, and another part is mutual inductance
Coil 4, earth leakage protective chip 5, thyristor and tripping coil self-test submodule；Digital processing module is for generating application circuit
2 control signal controls the working condition of 1 output pin of self-test chip, the comparison result of processing hysteresis comparator output, judgement
Whether tripping coil, thyristor, the function of mutual inductor 4 and earth leakage protective chip 5 are normal, if discovery failure, output termination
Signal.
The self-test chip 1 after powering on 2s for the first time to tripping coil, thyristor, mutual inductor 4, high-power switch tube with
And earth leakage protective chip 5 is detected, if discovery failure, generates termination signal disconnecting circuit；If function is normal, self-test is complete for the first time
A self-test is carried out every 15min after, does not influence the normal work of load appliance during self-test.
The application circuit 2 controls high-power switch tube by controlling the grid or base voltage of high-power switch tube
The on-off of place branch.
The high-power switch tube keeps high in the time from except the overhaul period, the grid or base stage of high-power switch tube
Level does not influence the normal work of earth leakage protective device.
The simulation electric leakage generation circuit 3, is carrying out mutual inductor 4, earth leakage protective chip 5, thyristor and tripping coil
During fault detection, triode is switched on, which generates simulation leakage current, to detect mutual inductor 4, earth leakage protective chip
5, the function of thyristor and tripping coil.
The counting module includes 2s counter, 15min counter, two 20ms counters, 60ms counter, wherein
2s counter triggers two 20ms counters for power-on self-test for the first time；After 15min counter is used for self-test for the first time
A self-test is carried out every 15min, triggers two 20ms counters；The first counter of 20ms is for being limited in 0 ~ 20ms to big
Power switch tube carries out fault detection, and the second counter of 20ms is for triggering 60ms counter and simulation electric leakage signal；60ms meter
Number device carries out failure inspection to mutual inductor 4, earth leakage protective chip 5, thyristor and tripping coil for being limited in 20 ~ 80ms
It surveys.
High power switch tube grid or base stage are locked in low by the high-power switch tube detection module in 0 ~ 4ms
Level, digital processing module output function control signal and set high-power switch tube detection for SCR TEST pin function, lead to
It crosses SCR TEST pin and the drain electrode of high-power switch tube or collector is locked in high level；After 4ms, high-power switch tube is given
Grid perhaps base stage send high level pass through switching tube detect pin monitor high-power switch tube drain electrode or collector electricity
Pressure；If switching tube detection pin detects voltage failing edge in 4 ~ 20ms, then illustrate that the function of high-power switch tube is normal,
It closes and resets the first counter of 20ms, high power switch tube grid or base stage are relocked as low level, by SCR TEST
Pin function is switched to thyristor detection function；If switching tube detection pin is continuously high level, then explanation is big in 4 ~ 20ms
Power switch tube does not have normally, and the first counter of 20ms is completed after counting, and output high level triggers termination signal.
Second counter of 20ms is completed after counting, and triggers 60ms counter, and trigger FAULT TEST pin
High level is exported, turn-on transistor generates simulation leakage current.
The counting module triggers 60ms counter by the second counter of 20ms, and trigger FAULT in 20ms
TEST pin exports high level, generates simulation leakage current；The induction simulation leakage current of mutual inductor 4, earth leakage protective chip 5 are handled mutually
The electric leakage signal that sense coil 4 senses, sends trip signal, drives turn on thyristors；The grid or base of high-power switch tube
Pole is locked in low level, can only only be enough conducting thyristor, nothing by resistance branch conducting thyristor, the electric current of resistance branch
Method makes tripping coil thread off, and does not influence the normal work of load appliance；If the function of mutual inductor 4 and earth leakage protective chip 5 is just
Often, then trip signal can be generated；If thyristor function is normal, and tripping coil is normally connect with phase line, and trip signal is led
After logical thyristor, the crest voltage of electric resistance partial pressure branch is higher than reference level, divides electricity by SCR TEST pin monitoring resistor
The partial pressure that rood arrives, if the crest voltage of electric resistance partial pressure branch is higher than reference voltage, hysteresis comparator exports high level pulse, says
Bright mutual inductor 4, earth leakage protective chip 5, thyristor and tripping coil function are normal.The high level pulse that comparator generates is used
In shutdown 60ms counter, triggering FAULT TEST pin exports low level, shutdown simulation leakage current, when thyristor is closed completely
It has no progeny, the grid of high-power switch tube or base stage is relocked as high level；If comparator is not defeated in 20 ~ 80ms
High level pulse out illustrates in mutual inductor 4, earth leakage protective chip 5, thyristor or tripping coil with the presence of element failure,
After 60ms counter is completed to count, counter generates high level and triggers termination signal.
A kind of earth leakage protective device using the earth leakage protective device self-checking unit, including self-test chip 1, application circuit 2,
Simulation electric leakage generation circuit 3, earth leakage protective chip 5, application circuit 2 are connected with earth leakage protective chip 5.
The course of work of self-test chip is described in detail below.
As shown in Fig. 2, electrification reset circuit resets the module in self-test chip, and triggers after powering on for the first time
2s counter, after 2s counter is completed to count for the first time, counter exports high level, is used as opening two 20ms meters
The trigger signal of number device.In 0 ~ 4ms, switch controlled pin exports low level, by Q in Fig. 12Grid or base level
It is locked in low level；It is high level that built-in function, which controls signal, as shown in figure 3, when built-in function control signal is high level,
SCR TEST pin is detected for high-power switch tube；Pass through SCR TEST pin and D1Pipe is by R3End is locked in high level, passes through
Switching tube detects the pin monitoring high-power switch tube drain electrode perhaps collector level drain electrode of high-power switch tube or collection at this time
Electrode is high level.In 4 ~ 20ms, switch controlled pin exports high level, at this time the grid of power tube and drain electrode or base
Pole and collector are high level, if high-power switch tube function is normal, high-power switch tube is switched on, high-power switch tube leakage
Pole or collector voltage become low level, and switching tube detection pin detects that a failing edge signal, switching tube detect pin
The failing edge detected exports low level for turning off the first counter of 20ms, switch controlled pin, turns off high power switch
Pipe, built-in function control signal and export low level, and pin function is switched to transistors breakdown detection；If switching tube function is not just
Often, switching tube detection pin can't detect failing edge, and the first counter of 20ms is completed to count, and generates high level and triggers termination signal
Cutting power supply.
As shown in Fig. 2, the second counter of 20ms starts to carry out mutual inductance for triggering 60ms counter and simulation electric leakage signal
The fault detection of coil, earth leakage protective chip, thyristor and tripping coil.Firstly, 20ms counter is completed after counting, generate
It high level triggering 60ms counter and triggers FAULT TEST pin output high level Q in Fig. 1 is connected1, pass through R7、Q1Branch
Road generates simulation leakage current in the loop.Simulation leakage current is for detecting mutual inductor, earth leakage protective chip, thyristor and taking off
Whether the function of fastening wire circle is normal.If the above component function is all normal, mutual inductor induction simulation leakage current, earth leakage protective core
Trip signal thyristor Q into Fig. 1 is exported after the electric leakage signal that piece processing senses3Gate pole, when phase line is in positive half period
When, thyristor Q3Anode is positive voltage, due to after completing high-power switch tube self-test switch controlled pin by Q2Grid or
Person's base stage is locked in low level, so can not pass through Q3、R3、Q2Access is generated, Q can only be passed through3、R1、R2Generation access, and R1、R2
Resistance value is very big, Q3、R1、R2The electric current of branch can only make turn on thyristors, and tripping coil can not be made to generate sufficiently strong magnetic force and pulled open
Switch.After turn on thyristors, the voltage of phase line passes through R1、R2Branch partial pressure, R2On obtained partial pressure it is defeated by SCR TEST pin
Enter self-test chip, be compared with reference level, if peak level is higher than internal reference level, the high electricity of comparator output
Flat, for turning off 60ms counter, triggering FAULT TEST pin exports low level, shutdown simulation leakage current, when thyristor quilt
After complete switching off, the grid of high-power switch tube or base stage are relocked as high level；Mutual inductor, earth leakage protective core
There are functional faults for piece, thyristor and any device of tripping coil, can all lead to R2On partial pressure will remain low level；
In 60ms, if comparator does not generate high level to reset 60ms counter, 60ms counter is completed to trigger after counting and be terminated
Signal is powered to cut off.
If self-test for the first time does not find that every 15min is repeated once aforesaid operations later with the presence of element failure.In self-test week
There are failures for discovery element in phase, then disconnect power supply, give a warning.
In the time from except the overhaul period, switch controlled pin exports high level, if detecting really simulation electric leakage
Stream, simulation electric leakage chip export trip signal, and switch controlled pin is high level, Q3、R3、Q2A low impedance path can be generated,
Wherein, R3Resistance value is far smaller than R1And R2Resistance value, the high current of generation can make tripping coil generate sufficiently large magnetic force to draw
Switch, cutting power supply.
Claims (10)
1. a kind of earth leakage protective device self-checking unit characterized by comprising self-test chip (1), application circuit (2), simulation electric leakage
Generation circuit (3)；
The application circuit (2) include: tripping coil, thyristor, current-limiting resistance, high-power switch tube and electric resistance partial pressure branch,
Power supply circuit (6), mutual inductor (4)；
Simulation electric leakage generation circuit (3), including triode and resistance generate simulation leakage current；
Mutual inductor (4), the simulation leakage current that induction simulation electric leakage generation circuit (3) generates；
Power supply circuit (6) is earth leakage protective device chip (5), self-test chip (1) provides supply voltage；
The self-test chip (1) includes:
Reference voltage generation module provides reference voltage for comparator；
The electric resistance partial pressure branch is divided and is compared with reference voltage by hysteresis comparator, generates electric resistance partial pressure branch partial pressure
Comparison pulse；
Reference circuit provides direct current biasing；
Clock generation module provides clock for digital processing module；
Digital processing module, including counting module, selftest module；
The selftest module includes two parts, and a part is high-power switch tube self-test submodule, and another part is mutual inductance
Coil (4), earth leakage protective chip (5), thyristor and tripping coil self-test submodule；Digital processing module is for generating application
The control signal of circuit (2) controls the working condition of self-test chip ((1)) output pin, the ratio of processing hysteresis comparator output
Compared with as a result, judging whether the function of tripping coil, thyristor, mutual inductor (4) and earth leakage protective chip (5) is normal, if hair
Existing failure, output termination signal.
2. earth leakage protective device self-checking unit as described in claim 1, which is characterized in that the self-test chip (1) is on for the first time
Tripping coil, thyristor, mutual inductor (4), high-power switch tube and earth leakage protective chip (5) are detected after electric 2s,
If it was found that failure, generates termination signal disconnecting circuit；If function is normal, carried out once certainly after the completion of self-test for the first time every 15min
Inspection, does not influence the normal work of load appliance during self-test.
3. earth leakage protective device self-checking unit as described in claim 1, which is characterized in that the application circuit (2) passes through control
The grid or base voltage of high-power switch tube, the on-off of branch where control high-power switch tube.
4. earth leakage protective device self-checking unit as described in claim 1, which is characterized in that the high-power switch tube is in self-test week
Time except phase, the grid or base stage of high-power switch tube keep high level, do not influence the normal work of earth leakage protective device.
5. earth leakage protective device self-checking unit as described in claim 1, which is characterized in that generation circuit (3) are leaked electricity in the simulation,
During progress mutual inductor (4), earth leakage protective chip (5), thyristor and tripping coil fault detection, triode is switched on,
The branch generates simulation leakage current, to detect mutual inductor (4), earth leakage protective chip (5), thyristor and tripping coil
Function.
6. earth leakage protective device self-checking unit as described in claim 1, which is characterized in that the counting module includes that 2s is counted
Device, 15min counter, two 20ms counters, 60ms counter, wherein 2s counter is touched for power-on self-test for the first time
Send out two 20ms counters；15min counter triggers two for carrying out a self-test every 15min after self-test for the first time
20ms counter；The first counter of 20ms carries out fault detection to high-power switch tube for being limited in 0 ~ 20ms, 20ms the
Two counters are for triggering 60ms counter and simulation electric leakage signal；60ms counter is for being limited in 20 ~ 80ms to mutual inductance
Coil (4), earth leakage protective chip (5), thyristor and tripping coil carry out fault detection.
7. earth leakage protective device self-checking unit as described in claim 1, which is characterized in that the high-power switch tube detects mould
High power switch tube grid or base stage are locked in low level, the control of digital processing module output function in 0 ~ 4ms by block
SCR TEST pin function is set high-power switch tube detection by signal, by SCR TEST pin by high-power switch tube
Drain electrode or collector are locked in high level；After 4ms, grid or base stage to high-power switch tube send high level, pass through
Switching tube detects the voltage of pin monitoring high-power switch tube drain electrode or collector；If in 4 ~ 20ms, switching tube detection pipe
Foot detects voltage failing edge, then illustrates that the function of high-power switch tube is normal, closes and resets the first counter of 20ms, by big function
Rate switch tube grid or base stage relock as low level, and SCR TEST pin function is switched to thyristor detection function；
If switching tube detection pin is continuously high level in 4 ~ 20ms, then illustrate that high-power switch tube does not have a normally, 20ms the
One counter is completed after counting, and output high level triggers termination signal.
8. earth leakage protective device self-checking unit as claimed in claim 6, which is characterized in that second counter of 20ms completes meter
After number, 60ms counter is triggered, and triggers FAULT TEST pin output high level, turn-on transistor generates simulation electric leakage
Stream.
9. earth leakage protective device self-checking unit as claimed in claim 6, which is characterized in that the counting module leads in 20ms
The second counter of 20ms triggering 60ms counter is crossed, and triggers FAULT TEST pin output high level, generates simulation electric leakage
Stream；Mutual inductor (4) induction simulation leakage current, the electric leakage signal that earth leakage protective chip (5) processing mutual inductor (4) senses,
Trip signal is sent, turn on thyristors is driven；The grid or base stage of high-power switch tube are locked in low level, can only pass through
The electric current of resistance branch conducting thyristor, resistance branch is only enough conducting thyristor, tripping coil can not be made to thread off, and does not influence to bear
Carry the normal work of electric appliance；If the function of mutual inductor (4) and earth leakage protective chip (5) is normal, trip signal can be generated；
If thyristor function is normal, and tripping coil is normally connect with phase line, after trip signal conducting thyristor, electric resistance partial pressure branch
Crest voltage be higher than reference level, the partial pressure obtained by SCR TEST pin monitoring resistor bleeder circuit, if electric resistance partial pressure
The crest voltage of branch is higher than reference voltage, and hysteresis comparator exports high level pulse, illustrates mutual inductor (4), earth leakage protective
Chip (5), thyristor and tripping coil function are normal,
The high level pulse that comparator generates exports low level, closes for turning off 60ms counter, triggering FAULT TEST pin
Disconnected simulation leakage current relocks the grid of high-power switch tube or base stage for high electricity after thyristor is completely switched off
It is flat；If comparator, without output high level pulse, illustrates mutual inductor (4), earth leakage protective chip (5), crystalline substance in 20 ~ 80ms
With the presence of element failure in brake tube or tripping coil, after 60ms counter is completed to count, counter generates high level touching
Send out termination signal.
10. a kind of earth leakage protective device using earth leakage protective device self-checking unit as described in claim 1, which is characterized in that packet
Include self-test chip (1), application circuit (2), simulation electric leakage generation circuit (3), earth leakage protective chip (5), application circuit (2) and leakage
Electric protection chip (5) is connected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910366354.0A CN110146768B (en) | 2019-05-05 | 2019-05-05 | Leakage protector self-checking device and leakage protector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910366354.0A CN110146768B (en) | 2019-05-05 | 2019-05-05 | Leakage protector self-checking device and leakage protector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111565490A (en) * | 2019-10-30 | 2020-08-21 | 华域视觉科技(上海)有限公司 | Starting method, system, medium and equipment of boost chip for automobile LED signal lamp |
| CN112782497A (en) * | 2019-11-11 | 2021-05-11 | 阳光电源股份有限公司 | Arc detection device and self-detection method thereof |
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| CN110146768B (en) | 2020-08-04 |
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